The microstructural feature of Al-In monotectic alloy processed under microgravity has been investigated It was found that in the sample cooled in space,there are a lot of In particles in A! dendrite,but no particle has been observed in the sample cooled on the ground.Moreover, the In particles distribute with regularity and the A1 dendrite has an obvious boundary layer marked by a string of particles.Thus,the distinction between them may reflect the character- istics of the solid/liquid interface during solidification under different gravity conditions.
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